Question

Ranikhet disease is found in
A. Honey bees
B. Hens
C. Fishes
D. Pigs

Answer 1

Hint: Ranikhet disease is known as NewCastle Disease named after the virus which causes it- New Castle Virus (NVD). This disease is generally found in birds which can cause $50 - 100$ mortality. This disease is prevalent worldwide affecting both domestic and wild birds.

Complete answer:
Ranikhet disease is caused by a virus belonging to the Paramyxovirus family of viruses. This virus is a single-stranded RNA genome virus that generally affects the lower respiratory tract. This disease occurs in birds like domesticated fowl, ducks, geese, hens, turkey.
It has a lot of symptoms including diarrhea, acute respiratory disease, along with certain nervous symptoms like twisted heads and depression.
Honey bees, fishes, and pigs are not birds, so there are no chances of Ranikhet disease occurring in them.
Therefore, option (a), (c) and (d) are incorrect.
The only bird in the options is the hen.

Hence, the correct answer is option (B).

Additional information:
The disease is transmitted through fecal exposure or direct contact with the infected bird. The capacity of the virus to infect depends on the immunity of the bird which can be high or low. The virus survives in the feathers of the birds and manure because of the warm environment. On exposure to ultraviolet radiation or dehydration, the virus may die. Vaccination and quarantining measures are the only preventive measure one can take. Vaccine on New Castle Virus is commercially very economical.

Note: The disease is very fatal for birds and the mortality rate is around $90$ percent in birds. Also, one important feature is that human transmission of the virus is possible. If humans consume meat or meat products of animals which are infected, then this virus can be transmitted to humans as well. Some of the humans who have been infected with this virus show mild symptoms of influenza and conjunctivitis.